diff --git a/src/modules/echo-cancel/adrian-aec.h b/src/modules/echo-cancel/adrian-aec.h
index efb9e2749..0efe53ee1 100644
--- a/src/modules/echo-cancel/adrian-aec.h
+++ b/src/modules/echo-cancel/adrian-aec.h
@@ -306,7 +306,7 @@ struct AEC {
   // NLMS-pw
   REAL x[NLMS_LEN + NLMS_EXT];  // tap delayed loudspeaker signal
   REAL xf[NLMS_LEN + NLMS_EXT]; // pre-whitening tap delayed signal
-  REAL w_arr[NLMS_LEN+16];      // tap weights
+  REAL w_arr[NLMS_LEN + (16 / sizeof(REAL))]; // tap weights
   REAL *w;                      // this will be a 16-byte aligned pointer into w_arr
   int j;                        // optimize: less memory copies
   double dotp_xf_xf;            // double to avoid loss of precision